The difference I'm specifically curious about is the issue about 'downloading' arbitrary code and evaluating it. Current app offerings don't have this support because Apple has forbidden it in the past unless the evaluation goes through the Javascript context of a web view, which doesn't appear to be the case for PencilCase. I guess I'm curious if they have relaxed their restrictions in this case, are unaware of that feature, or something else.
Yeah, App Store guidelines can be ambiguous, and JavaScriptCore becoming a public framework could be seen as an endorsement of this type of functionality, but we don't have any information that you wouldn't.